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CondominiumResidential
$1,374,245$390 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 96How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026
Last sold for $785,000 on Jun 28, 2007

18 WALNUT ST

ACTON, MA 01720
4
Beds
3.5
Baths
3,522 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.95 ac
Lot SizeThe size of the land the home sits on, from county records.
1997
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1.4M
$1.3M low$1.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$785,000 · Jun 28, 2007

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$20,510 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$1,195,900 (2025)
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,195,900
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,305,870

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Condominium
StyleThe architectural style of the home, such as ranch or colonial.Condo/Apartment
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.94
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(14)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Luther Conant Elementary SchoolA+
Elementary · Grades KG–6 · 2.7 mi
H
Acton - Boxborough Regional High SchoolA
High · Grades 9–12 · 2.8 mi
M
R. J. Grey Junior High SchoolA
Middle · Grades 7–8 · 3.0 mi

District: Acton-Boxborough School District

Neighborhood · ZIP 01720These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.71
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.72

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.33%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.24,473
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,210 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$148,952
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$187,397
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.47 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

18 Walnut St measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth more than 92% of homes in Acton 01720
  • Costs less per square foot than 69% of homes in Middlesex County
  • Bigger than 93% of homes in Acton 01720
  • Has a bigger lot than 78% of homes in Middlesex County
  • Newer than 87% of homes in Middlesex County

What homes are worth in Acton 01720

Each bar is how many homes fall in that price range. The marker is this home.

This home
$222K$1.7M

This home is worth more than 92% of homes in Acton 01720.

How it measures up in Acton 01720

The dot is this home. The mark in the middle is the typical home in Acton 01720.

Estimated value$1,374,245
CheaperTypical $855,764Pricier

Pricier than 92% of homes nearby

Price per ft²$390
CheaperTypical $410Pricier

Pricier than 36% of homes nearby

Living area3,522 ft²
SmallerTypical 2,087 ft²Bigger

Bigger than 93% of homes nearby

Lot size0.95 ac
SmallerTypical 0.72 acBigger

Bigger than 60% of homes nearby

Year built1997
OlderTypical 1971Newer

Newer than 82% of homes nearby

How 18 Walnut St ranks against every home in each area.
MeasureThis homeActon 01720Middlesex County
Estimated valuepricier than$1,374,24592% of homes85% of homes
Price per ft²pricier than$39036% of homes31% of homes
Living areabigger than3,522 ft²93% of homes92% of homes
Lot sizebigger than0.95 ac60% of homes78% of homes
Year builtnewer than199782% of homes87% of homes

About 18 Walnut St

How much is 18 Walnut St, Acton, MA worth?

The TopHap Estimate for 18 Walnut St, Acton, MA is $1,374,245 as of Aug 30, 2026. The likely range is $1,325,921 to $1,422,569. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18 Walnut St, Acton, MA last sell?

18 Walnut St, Acton, MA last sold on Jun 28, 2007 for $785,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 18 Walnut St, Acton, MA?

18 Walnut St, Acton, MA has 4 bedrooms, 3.5 bathrooms, 3,522 square feet of living space and a 0.94-acre lot.

When was 18 Walnut St, Acton, MA built?

18 Walnut St, Acton, MA was built in 1997, making it 29 years old. It is a condo/apartment home. The building has 2 stories.

What schools serve 18 Walnut St, Acton, MA?

18 Walnut St, Acton, MA is assigned to Luther Conant Elementary School (elementary), rated A+; Acton - Boxborough Regional High School (high), rated A; R. J. Grey Junior High School (middle), rated A. All sit in Acton-Boxborough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 18 Walnut St, Acton, MA compare to other homes in Acton 01720?

Among the 7,508 homes in Acton 01720, it is worth more than 92% of them ($1,374,245 against a typical $855,764), its price per square foot is higher than 36% of them ($390 against a typical $410), it is bigger than 93% of them (3,522 ft² against a typical 2,087 ft²), its lot is bigger than 60% of them (0.95 ac against a typical 0.72 ac) and it is newer than 82% of them (1997 against a typical 1971). Measured against all of Middlesex County, it is worth more than 85% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 18 Walnut St, Acton, MA?

The 2025 property tax bill for 18 Walnut St, Acton, MA was $20,510. The county assessed it at $1,195,900.

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